A． it might be possible to change its atmosphere
B． its atmosphere is the same as the earth's
C． there is a good supply of water on Venus
D． the days on Venus are long enough
A． live in very hot temperatures
B． live in very cold temperatures
C． manufacture oxygen
D． all of the above
A． the algae have done their work
B． the atmosphere becomes cooler
C． there is oxygen
D． it rains there